Fix systemic missing-colon bugs in layout.css where property values
like top, left, right, bottom, gap, padding were directly followed by
var() without a colon separator. This broke all fixed-position panels
in the live view. Also add missing --space-half token to tokens.css
and complete design token migration across remaining CSS files.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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